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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93f177d523022ef9310be6bff8b43801a56880780a8669de9def5b43e9b50cd' 
  AND token = '0EFhlaZOBl/D8zF4IM3G4Bglv3UGI56vE0E7RPEQar0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}